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Locksmiths use graphite lock fluid. It's sold in a can as such (or at least it was decades ago). I have some on my shelf and it is indispensable when needed.
It's probably kerosine mixed with graphite, marketed in a convenient squeeze-nozzle can to squirt it into the lock.
It works well, even though it is messy, temporarily. In cold, wet weather older locks on cars and household doors might seize up, meaning they become hard to turn. Using graphite lock fluid is the cure. IT WORKS!
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